1999 Pontiac Grand Am Speedometer

1999 PONTIAC GRAND AM
140,000 MILES • 6 CYL • FWD • AUTOMATIC
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C.MEDRANO
  • MEMBER
  • 1 POST
Speedometer not working properly. Actual maybe 30 mph and speedometer showing 120 mph.
Mar 11, 2010 at 4:12 AM
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BLUELIGHTNIN6
  • ✓ASE Certified Mechanic
  • 16,542 POSTS
  • ASE Certified Mechanic
need to perform the speedo gauge sweep test using a scan tool. connect scan tool to DLC and turn ignition on. select instrument panel cluster (IPC) special functions IPC gauges on scan tool. . perform speedo gauge sweep. should make speedo to go from 0 MPH to max speed and then back to 0 MPH smoothly. let me know how it goes..
Mar 11, 2010 at 2:14 PM
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